QTX and IRF540Z ( my last one i smoked 9)
this version has about 2500 pF G-S
It can run at 5A 22V with the highest output sofar
but at 100W input level everything heaths up coils and IRF
the antenna current meter relative 60-70%
must be close to 100W rf
the standard IRF540 measured 2700pF
this one is second best about antenna 50%
it is very critical in tuning the IRF540 starts in self oscillating mode then the output and current
sudden drops to very low
I can get 100W level with the QTX but on the edge and only with the Z version of the
IRF540 still have to fine tune with a piece of ferrit to have max ou…